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Fair Value
 3 Months Ended
Mar. 26, 2022
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
Whenever possible, the fair values of our financial assets and liabilities are determined using quoted market prices of identical securities or quoted market prices of similar securities from active markets. The three levels of inputs that may be used to measure fair value are as follows:
•Level 1 valuations are obtained from real-time quotes for transactions in active exchange markets involving identical securities;
•Level 2 valuations utilize significant observable inputs, such as quoted prices for similar assets or liabilities, quoted prices near the reporting date in markets that are less active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and
•Level 3 valuations utilize unobservable inputs to the valuation methodology and include our own data about assumptions market participants would use in pricing the asset or liability based on the best information available under the circumstances.

We did not have any transfers of assets or liabilities measured at fair value on a recurring basis to or from Level 1, Level 2 or Level 3 during fiscal 2022, 2021 or 2020.

The carrying values of Cash, Accounts receivable, net, Restricted cash, Prepaid expenses and other current assets, Accounts payable, and Accrued liabilities approximate fair value due to their short maturities.

No changes were made to our valuation techniques during fiscal 2022.

Cash Equivalents
The fair value of our cash equivalents is determined based on quoted market prices for similar or identical securities.

Marketable Securities
We classify our marketable securities as available-for-sale and value them utilizing a market approach. Our investments are priced by pricing vendors who provide observable inputs for their pricing without applying significant judgment. Broker pricing is used mainly when a quoted price is not available, the investment is not priced by our pricing vendors or when a broker price is more reflective of fair value. Our broker-priced investments are categorized as Level 2 investments because fair value is based on similar assets without applying significant judgments. In addition, all of our investments have a sufficient level of trading volume to demonstrate that the fair value is appropriate.
Assets and liabilities Measured at Fair Value on a Recurring Basis
Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands): 
December 31, 2022Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$21,279 $— $— $21,279 
Commercial paper— 4,969 — 4,969 
U.S. agency securities— 996 — 996 
21,279 5,965 — 27,244 
Marketable securities:
 U.S. treasuries25,019 — — 25,019 
 Certificates of deposit— 706 — 706 
 U.S. agency securities— 11,045 — 11,045 
 Corporate bonds— 67,396 — 67,396 
 Commercial paper— 24,840 — 24,840 
25,019 103,987 — 129,006 
Foreign exchange derivative contracts— 664 — 664 
Promissory note receivable— — 943 943 
Interest rate swap derivative contracts— 2,374 — 2,374 
Total assets$46,298 $112,990 $943 $160,231 
Liabilities:
Foreign exchange derivative contracts$— $(193)$— $(193)
Total liabilities$— $(193)$— $(193)
December 25, 2021Level 1Level 2Level 3Total
Assets:
Cash equivalents:
 Money market funds$9,526 $— $— $9,526 
U.S. treasuries2,500 — — 2,500 
Commercial paper— 1,000 — 1,000 
U.S. agency securities— 5,556 — 5,556 
12,026 6,556 — 18,582 
Marketable securities:
 U.S. treasuries38,985 — — 38,985 
 Certificates of deposit— 1,199 — 1,199 
 Corporate bonds— 52,709 — 52,709 
 Commercial paper— 32,162 — 32,162 
38,985 86,070 — 125,055 
Interest rate swap derivative contracts— 629 — 629 
Total assets$51,011 $93,255 $— $144,266 
Liabilities:
Foreign exchange derivative contracts$— $(489)$— $(489)
Interest rate swap derivative contracts$— $(55)$— $(55)
Total liabilities$— $(544)$— $(544)

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
We measure and report our non-financial assets such as Property, plant and equipment, Goodwill and Intangible assets at fair value on a non-recurring basis if we determine these assets to be impaired or in the period when we make a business acquisition. Other than as discussed in Note 4, Acquisitions and Note 7, Restructuring Charges, there were no assets or liabilities measured at fair value on a non-recurring basis during fiscal 2022, 2021 or 2020.